How to do calculations with a 2 CIM, 1 Mini-CIM gearbox?

[Jay O'Donnell]

Hi CD,
I've been working on drivetrain designs lately and I've been looking into using a 2 CIM, 1 Mini CIM gearbox. I've been told by people from multiple teams that this is ok to do and that I shouldn't have to change the pinion gear on the mini CIM. Can someone help me figure out things like torque and free speed of a gearbox like that? I don't really know how to find gearbox calculations besides just plugging into JVN Calculator, so I'd like to learn how to calculate it.